CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue	$ 2,218,915	$ 2,636,746	$ 2,843,877
Cost of revenue:
Total cost of revenue	1,032,786	1,316,145	1,510,016
Gross profit	1,186,129	1,320,601	1,333,861
Operating expenses:
Marketing	339,355	395,737	400,918
Selling, general and administrative	806,945	870,961	901,829
Restructuring charges	31	(136)	18,828
Gain on sale of intangible assets	0	0	(17,149)
Total operating expenses	1,146,331	1,266,562	1,304,426
Income (loss) from operations	39,798	54,039	29,435
Other income (expense), net	(53,329)	(53,008)	6,710
Income (loss) from continuing operations before provision (benefit) for income taxes	(13,531)	1,031	36,145
Provision (benefit) for income taxes	761	(957)	7,544
Income (loss) from continuing operations	(14,292)	1,988	28,601
Income (loss) from discontinued operations, net of tax	2,597	0	(1,974)
Net income (loss)	(11,695)	1,988	26,627
Comprehensive income attributable to noncontrolling interests	(10,682)	(13,067)	(12,587)
Net income (loss) attributable to Groupon, Inc.	$ (22,377)	$ (11,079)	$ 14,040
Basic net income (loss) per share:
Continuing operations (in usd per share)	$ (0.04)	$ (0.02)	$ 0.03
Discontinued operations (in usd per share)	0.00	0	0.00
Basic net income (loss) per share (in usd per share)	(0.04)	(0.02)	0.03
Diluted net income (loss) per share:
Continuing operations (in usd per share)	(0.04)	(0.02)	0.03
Discontinued operations (in usd per share)	0.00	0	(0.01)
Diluted net income (loss) per share (in usd per share)	$ (0.04)	$ (0.02)	$ 0.02
Weighted average number of shares outstanding:
Basic (in shares)	567,408,340	566,511,108	559,367,075
Diluted (in shares)	567,408,340	566,511,108	568,418,371
Service
Revenue:
Total revenue	$ 1,126,357	$ 1,205,487	$ 1,266,452
Cost of revenue:
Total cost of revenue	114,462	120,077	160,810
Product
Revenue:
Total revenue	1,092,558	1,431,259	1,577,425
Cost of revenue:
Total cost of revenue	$ 918,324	$ 1,196,068	$ 1,349,206